Originally Posted by
mechBgon
California, Colorado and Montana do (reflectorized tires can be substituted). Nevada and Utah stipulate either side reflectivity, or lights that accomplish the same. That's from a check of states from Oregon to South Dakota, I'm not going to do them all right now
"Side reflectivity" is not just "wheel reflectors". It doesn't appear that it is common that states
specifically requires "wheel reflectors".
Of the three, only Montana mentions wheel reflectors.
http://data.opi.mt.gov/bills/mca/61/8/61-8-607.htm
(3) Every bicycle when in use at nighttime shall be equipped with either tires with retroflective sidewalls or reflectors mounted on the spokes of each wheel. Spoke mounted reflectors shall be within 76 millimeters (3 inches) of the inside of the rim and shall be visible on each side of the wheel. The reflectors on the front wheel shall be essentially colorless or amber and the reflectors on the rear wheel shall be amber or red.
Colorado does not.
http://colobikelaw.com/law.php
Every bicycle, electrical assisted bicycle, or EPAMD when in use at the times described in section 42-4-204 shall be equipped with reflective material of sufficient size and reflectivity to be visible from both sides for six hundred feet when directly in front of lawful lower beams of head lamps on a motor vehicle or, in lieu of such reflective material, with a lighted lamp visible from both sides from a distance of at least five hundred feet.
California does not.
http://www.sacbike.org/sacbiking/CVCLaws.htm
(d) Every bicycle operated upon any highway during darkness shall be equipped (1) with a lamp emitting a white light which, while the bicycle is in motion, illuminates the highway in front of the bicyclist and is visible from a distance of 300 feet in front and from the sides of the bicycle; (2) with a red reflector on the rear which shall be visible from a distance of 500 feet to the rear when directly in front of lawful upper beams of headlamps on a motor vehicle; (3) with a white or yellow reflector on each pedal visible from the front and rear of the bicycle from a distance of 200 feet; and (4) with a white or yellow reflector on each side forward of the center of the bicycle, and with a white or red reflector on each side to the rear of the center of the bicycle, except that bicycles which are equipped with reflectorized tires on the front and the rear need not be equipped with these side reflectors. Such reflectors and reflectorized tires shall be of a type meeting requirements established by the department.
...
(b) No person shall sell, or offer for sale, a new bicycle that is not equipped with a red reflector on the rear, a white or yellow reflector on each pedal visible from the front and rear of the bicycle, a white or yellow reflector on each side forward of the center of the bicycle, and a white or red reflector on each side to the rear of the center of the bicycle, except that bicycles which are equipped with reflectorized tires on the front and rear need not be equipped with these side reflectors.